11. Any hexachord not of the " Z " type is its own 6-Z11, and Forte number. 12. This trope contains [ 0, 2, 6 ] twice inside its first hexachord ( e . g. 13. To hear the scale of the hexachord sung for you is not something that can happen in a gallery space. 14. The cantus firmus is pitched on A, the highest note of the hexachord , and is in double augmentation. 15. In the early Middle Ages, a widespread musical tradition was based on the hexachord system defined by Guido of Arezzo. 16. A hexachord that is self-complementing for a particular permutation is referred to as " prime combinatorial ". 17. In the case of hexachords each may be referred to as a "'Z-hexachord " '. 18. The hexachord has also been used by Alexander Scriabin and B�la Bart�k but is not featured in the music of Igor Stravinsky. 19. The first, antecedent phrase uses the first hexachord of the basic series; the second, consequent phrase uses the second hexachord. 20. The first, antecedent phrase uses the first hexachord of the basic series; the second, consequent phrase uses the second hexachord .
